Bicycle frame



FIG. 1 is a side view of the present bicycle frame;

FIG. 2 is a rear elevation view of the bicycle frame of FIG. 1;

FIG. 3 is a front elevation view of the bicycle frame of FIG. 1;

FIG. 4 is a top plan view of the bicycle frame of FIG. 1;

FIG. 5 is a bottom plan view of the bicycle frame of FIG. 1; and,

FIG. 6 is an isometric view of the bicycle frame of FIG. 1. 

The ornamental design for a bicycle frame, as shown and described. 